does your cousin go to the gym?-- Twice a week.A. How long B. How often C. How soon

问题补充：

-- does your cousin go to the gym?

-- Twice a week.

A. How long B. How often C. How soon

答案：

解析：How long多长，多用来对时间长短进行提问；How often多久一次，提问频率；How soon多久，对将来时间进行提问。根据下文，一周两次。可知上文提问频率，故选B，你的表弟多久去一次体育馆？

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